Cobalt-nitrogen co-doped carbon nanotube catalyst, preparing method and application

A carbon nanotube and co-doping technology, applied in the field of electrocatalysis, can solve the problems of high price, scarce platinum reserves, unfavorable large-scale application, etc., and achieve the effect of low cost, stable catalyst performance, and excellent oxygen reduction activity

Inactive Publication Date: 2017-08-25
SUZHOU UNIV
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Problems solved by technology

So far, platinum-based catalysts are the best oxygen reduction catalysts, but platinu

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  • Cobalt-nitrogen co-doped carbon nanotube catalyst, preparing method and application
  • Cobalt-nitrogen co-doped carbon nanotube catalyst, preparing method and application
  • Cobalt-nitrogen co-doped carbon nanotube catalyst, preparing method and application

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Embodiment

[0032] Preparation of cobalt and nitrogen co-doped carbon nanotube (Co-N / CNT) catalysts:

[0033] The multi-walled carbon nanotubes (CNTs) were oxidized by the modified Hummers method, specifically: the first step, the carbon nanotubes were calcined in a muffle furnace at 500 °C for 1 h, and ultrasonically treated with dilute hydrochloric acid (10%) After half an hour, the iron element in the carbon nanotubes was removed, filtered with suction, and dried. In the second step, take 1 g of carbon nanotubes in a 250 mL round bottom flask, add 23 mL of concentrated sulfuric acid, and stir at room temperature for about 24 h. In the third step, heat the flask oil bath to 40°C and add 200 mg of NaNO 3 , stirred for 5 minutes, and then added 1 g of KMnO in batches 4 , keep the temperature not exceeding 45°C, and stir for 30 minutes to make the KMnO 4 Evenly dispersed in carbon nanotubes, easy to oxidize. Add 3 ml of water every 5 minutes, and keep the temperature not exceeding 45°C...

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Abstract

The invention discloses a cobalt-nitrogen co-doped carbon nanotube catalyst, a preparing method and application. Dopamine on carbon nanotubes are automatically polymerized and forms coordination bonds with cobalt ions, and the product is decomposed at high temperature to obtain the cobalt-nitrogen co-doped carbon nanotube catalyst with the carbon nanotubes as a core and an amorphous carbon layer as a shell structure. The amorphous carbon shell formed by polydopamine derivatization has rich structure defects, which is beneficial for forming cobalt-nitrogen/carbon active sites; as the carbon nanotubes are used as the core, the catalyst is excellent in conductivity and corrosion resistance. The two parts are used for achieving different functions, and efficient electrocatalytic activity is provided for the catalyst. In 1M potassium hydroxide solution, the half-wave potential of the catalyst is about 0.91 V, the content of hydrogen peroxide is smaller than 7%, and the stability is excellent. When the cobalt-nitrogen co-doped carbon nanotube catalyst is applied to a primary zinc-air battery, discharging voltage and currents and power density are remarkably improved, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a cobalt and nitrogen co-doped carbon nanotube catalyst, a preparation method and an application. Background technique [0002] Metal-air batteries have a relatively high theoretical energy density, which is 2 to 10 times that of lithium-ion batteries, due to the use of inexhaustible oxygen from the outside world as the positive electrode reactant. Metal lithium, zinc, aluminum, magnesium, potassium, etc. can be used as the negative electrode of metal-air batteries, but lithium is extremely unstable in air and aqueous solution, and the self-discharge phenomenon of magnesium and aluminum is serious, which restricts the use of these metal materials as battery negative electrodes. Practical development and application. However, zinc and iron are relatively stable in aqueous solution and can be charged and discharged effectively. Compared with iron, zinc has a ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9091Y02E60/50
Inventor 刘一玲李彦光
Owner SUZHOU UNIV
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